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When reading a compact disc, the player begins by reading theinformation near the center of the disc by rotating the CD at 450rpm. However, as it reaches the information at the edge of thedisc, the CD only revolves 200 rpm. If it takes 60 minutes to readthrough the disc:
a) what is its angular acceleration ( assume itsconstant)
b) What is its rate change of the CD's angular momentum?(treat the cd as a solid disc that is 120mm in diameter and has amass of 15g)
The red line of the Balmer series in hydrogen (? = 656.3 nm) is observed to split into three different spectral lines with ?? = 0.07 nm between two adjacent lines when placed in a magnetic field B. What is the value of B if ?? is due to the energy sp..
A wooden cube of side .3 m has a density of 700kg/m3 and floats partiall submerged in the seawater (density =1025 kg/m3) What distance from the bottom of the cube to the surface of the water? How much extra mass must be added so that the top of the c..
A 900 line/mm diffraction grating is illuminated by light of wavelength 600 nm. How many bright fringes are seen on a paper 0.20-m-wide screen located 0.5 m behind the grating? ( Hint: assume fringe , m=0 is at the center of the paper; hence, you ..
calculate the electric potential due to a dipole whose dipole moment is 4.5times10-30 cm at a point 1.4times10-9 m
A duck has a mass of 2.6 kg. As the duck paddles, a force of 0.11 N acts on it in a direction due east. In addition, the current of the water exerts the force of 0.12 N in a direction of 44° south of east. When these forces begin to act, the velocity..
In living tissue, about one out of every 10-12 carbon atoms are the 14C isotope. how long ago did the owner of the bone die
Water is flowing through a pipe (area 4.2 cm2) that connects to a faucet adjusted to have an opening of 0.48 cm2. what is its speed as it leaves the faucet
In figure, a ball is thrown up onto a roof, landing some timelater at height h = 20.0 m above and d = 30.0 m horizontally fromthe release point. The ball's path just before landing is angled atθ = 60.0o with the horizontal roof.
A solid cylinder with mass and radius, rotating with angular speed about an axis throughout its center, is set on the horizontal surface for which the kinetic friction coefficient is.
A gas molecule having a speed of 322 m/s collides elastically with another molecule of the same mass, which is initially at rest. Find the speed of each molecule after collision
A parallel-plate capacitor with plates of area 2.15 x 10-4m2 is being designed to have a capacitance of 1330 pF. What plate separation is required if the spacebetween the plates is filled with air
Suppose you point a pinhole camera at a 15-m-tall tree that is 75m away. If the film is 22cm behind the pinhold, what will be the size of the tree's image on the film
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